marshal



(Ne Model.) l

P. J. MARSHAL.

HARROW.

No. 334,180. Patented Jan. 12, 1886.

: E-l-. A

y E-Q u F EA-r FRANKLIN J. MARSHAL, OF VHEELER, NEW YORK, ASSIGNOR TO OTTO F. MARSHAL, JR., OF SAME PLACE.

HARROW.

SPECIFICATION forming part of Letters Patent No. 334,180, dated January l2, 1886.

Application filed May 14, 1885. Serial No. 165,509. (No model.)

T all whom zit may concern,.-

Beit known that I, FRANKLIN J. MARsHAL,

of Vheeler, in the county of Steuben, in the State of New York, have invented new and useful Improvements in Harrows, of which the following, taken in connection with the.

accompanying drawings, is a full, clear, and exact description.

In the operation of harrows it has been found that the friction and abrasion on the heads of the tie-bolts of the barrow-frame incident to the dragging of the same over the soil rapidly wears away the said heads, and thus destroys the integrity of the frame, and

in spring-tooth harrows the teeth loose their hold on the frame by the aforesaid destruction of the bolt-heads.

It is to obviate the aforesaid defects, and thus render the harrow more .durable which 2o my invention has for its object; and to that end my invention consists in the novel construction and combination of parts, as hereinafter fully described, and specifically pointed out in the claims.

The invention is fully illustrated in the annexed drawings, wherein Figure l is a perspective view of a portion of one of the styles of harrows for which my invention is specially adapted. Fig. 2 is an enlarged sectional view 3o' illustrating the application of my invention for securing a spring-tooth to the harrowframe. Fig. 3 is a detached plan view of the plate which is placed astride the shank of the spring-tooth. Fig. 4 is a sectional view illustrating the invention as employed for tying together the members of the barrow-frame. Fig. 5 is a transverse section taken at the side of a spring-tooth attached by my invention, and Fig. 6 is an inverted plan view of a portion of a spring-tooth harrow embodying my invention.

Similar letters of reference indicate corresponding parts.

A A represent the wooden bars of which the harrow-frame is formed, one set of said bars being placed across the other set and secured thereto by tie-bolts b'b passing vertically through said bars at their crossings. In order to obtain a more secure hold for the said tie-bolts on the frame, and guard against the 5c Wear and enlargement of the bolt-holes in the frame, a d at the same time protect the heads of thei1} ;bolts from wear and abrasion incident to the dragging of the same over the soil,

I place on the under side of the bottom bar A aplate or washer, C, provided with boltholes for the reception of the tie-bolts b b, and around the said bolt-holes I strike up from said plate, by means of suitable dies, concave-y convex portions forming concave countersinks oo c c on one side of the plate and protuberances d d on the opposite side of said plate, the latter side being placed against the under side of the bar A, and the protuberances of the plate being let into corresponding countersinks in said bar, as represented in Fig. 4 of the drawings, thereby obtaining a secure hold for said plate, so as to effectually prevent its movement laterally. The backs or shoulders of the heads of the bolts are made convex, corresponding to the concavity of the countersinks 0 c, so as to let said shoulders completely into them, as represented in Fig. 4 of the drawings, thereby protecting the chief portions of the bolt-heads from the wear and abrasion incident to their being dragged over the ground. when the harrow is in use. In fact, the bolts retain their hold until the plate is Worn out.

To prevent the bolts from turning, I make the bolt-holes of the plate O square, and provide 8o the bolts with corresponding square necks adjacent to the convex shoulders.

For the attachment of the spring-tooth T, I place the plate C astride the shank of the tooth and against the bar A, as shown in Fig. 8 5 2 of the drawings, and provide said plate with square bolt-holes c a at the edges of said Y shank, and with openings e e over the shanks and adjacent to one side of the bolt-hole, as illustratedin Fig. 3 of the drawings,and around 9o the remainder of the bolt-holes the plate is formed with the concave-convex countersinks c c. The tie-bolts b b are provided with the square necks, which extend through the square bolt-holes, and the backs of the bolt-heads are formed at one side with straight right-angled shoulders, which allow said portions of the bolt-heads to project into the openings e e of the plate C, and bear directly on the shank of Y The remaining portions of the the tooth. bolt-heads are formed with conveXed backs or shoulders, by which they are seated in the concave countersinks c c. Said countersinks being formed by pressing or striking portions of the plate from the plane thereof produces corresponding convex protuberances at the back of the plate, and said protuberances being countersunk or let into the bar A serve to prevent the plate from shifting on the bar, and thus contributes to the security of the at tachment of the spring-tooth.

I am aware that it is a common expedient to countersink the heads of bolts and screws in the plates or washers, through which said bolts or screws pass; hence I do not claim, broadly, a barrow-tooth attaohin g clip or plate provided around its bolt-holes with countersinks for the reception of the backs or shoulders of the bolt-heads; but

Vhat I do claim as new, and desire to secure by Letters Patent, is-

1. In a harrow-frame, the plate G, having boltholes with recesses and protnberances, respectively, on opposite sides of the plate around said bolt-ho1es, and having said pro tuberances seated in corresponding countersinks in the frame, and the tie-bolts having their heads seated in the recesses of the plate, substantially as set forth.

2. In combination with a barrow-frame and springteeth, plates placed astride the Shanks of said teeth and against the barrow-frame, and provided with bolt-holes at the edges of said shanks, and tie-bolts passingthrough said holes and having back of their heads straight right-angled shoulders abutting against the edges of the tooth-Shanks, substantially as set forth.

3. In combination with a barrow-frame and spring-teeth, plates or washers placed astride the shanks of the teeth and against theharrowframe, and provided with square bolt-holes at the edges of said-Shanks, and tie-bolts formed with square necks passing through the aforesaid bolt-holes and with straight right-angled shoulders under their heads and abutting against the edges of the shanks, substantially as described and shown.

4. In combination with the barrow-frame and spring-teeth, plates placed astride the shanks of the teeth and against the harrowframe, and provided with bolt-holes at the edges of said shanks and with openings over the shanks and adjacent to one side of the bolt-holes, and formed with countersinks around the remainder of the bolt-holes, and tie-bolts having the shoulder at one side of their heads bearing directly on the shanks of the teeth, and the remainder of the heads seated in the countersinks of the plates, as set forth and shown.

5. In combination with the barrow-frame and spring-teeth, plates placed astride the shanks of the teeth and against the harrowframe, and provided with square bolt-holes at the edges of said shanks, and with openings over the Shanks and adjacent to one side of the bolt-holes, and formed with concavo-convex countersinks around the remainder of the bolt-holes, and tie-bolts having square necks extending through the boltholes, straight right-angled shoulders on one side adjacent to said necks, and convex shoulders at the opposite side, substantiallyin the manner described and shown.

vIn testimony whereof I have hereunto signed my name and afxed my seal, in the presence of two attesting witnesses, at Bath, in the county of Steuben, in the State of New York, this 9th day of May, 1885. v

FRANKLIN J. MARsHAt. [n s] Witnesses:

LUoIUs A. WALDo, FRANK CAMPBELL. 

